FIX. RadForm - pixelized text in titlebar when a RadRibbonBar is added

To reproduce: on some Windows 10 machines the title bar's text is not rendered clearly.
Workaround:
1. Set the RadForm.AllowTheming property to false.
2. In the form's Load event change the TextRenderingHint of the caption text primitive to AntiAliasGridFit:
TextPrimitive tp = this.radRibbonBar2.RibbonBarElement.RibbonCaption.CaptionLayout.CaptionTextElement as TextPrimitive;
tp.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;

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